CT Sailbattens : strong, light, durable carbon fiber sail battens for Superyachts, America's Cup, Offshore Racers, Multihulls, Maxis, Cruisers

CT Sailbattens, manufacturers of carbon / kevlar sail battens for performance yachts

CT36 Superyacht

CT Jib/Headsail

Optional Extras

tel : +64 9 810 8406

CT Sailbattens

PO Box 58, Waitakere
Auckland 0660
New Zealand

European Enquiries

Fraser Brown
tel : +44 7816 550923

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Bend Tests Test methods and results

All CT Sailbattens are tested before dispatch to ensure consistancy and quality. Each batten contains a laminated barcode so that individual battens can be identified and bend characteristics replicated or modified. Battens are tested using a 3-point bend test. Results of the 3-point test can also be used to obtain an average EI value for the entire batten.

3-point bend test Battens are supported at each end and deflection is measured at 1/4, 1/2 and 3/4 points (see diagram below). Deflection values are recorded for: - self weight (amount of batten sag under its own weight) - with 6.8 (15lb) weight suspended from the 1/2 point.
3-point bend tests can be conducted on an existing set of battens, giving C-Tech staff target numbers to work from when designing a new set of battens. Click here for more detail on conducting 3-point bend tests.

Understanding bend test results Click here to view a PDF explaining bend test results in more detail.

EI Values An EI value (modulus of elasticity, also known as Young's Modulus) is often used to describe the stiffness of a beam.
A 3-point bend test gives an average EI value (in nM2) over the entire span. This is calculated using the following formula:
weight9.806testLength^3 -------------------------------- 48*(HlfDifference/1000)	HlfDifference = weighted defl. - self weight (measured at 1/2 point)
Actual EI values can be measured for the luff and leech of a batten using the test method shown at right.

Requesting specific batten stiffness C-Tech can design a set of battens to suit the requirements of your sail and sailing needs (eg. offshore racing vs inshore cruising). Sets of battens can also be custom-built with laminates changed to meet specific stiffness and draft requirements. Stiffness requirements can be represented using target EI values or as a % difference from an existing CT sailbatten.

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